EP 0373687 B1 19930602 - METHOD FOR THE PHOTOCHEMICAL CONVERSION OF TACHYSTEROL COMPOUNDS INTO PREVITAMIN D COMPOUNDS AND OF TRANS-VITAMIN D COMPOUNDS INTO CIS-VITAMIN D COMPOUNDS
Title (en)
METHOD FOR THE PHOTOCHEMICAL CONVERSION OF TACHYSTEROL COMPOUNDS INTO PREVITAMIN D COMPOUNDS AND OF TRANS-VITAMIN D COMPOUNDS INTO CIS-VITAMIN D COMPOUNDS
Publication
Application
Priority
NL 8803040 A 19881212
Abstract (en)
[origin: EP0373687A1] The invention relates to a method for the photochemical conversion of tachysterol compounds into previtamin D compounds and of trans-vitamin D compounds into cis-vitamin D compounds under the influence of radiation, by exposing the tachysterol compound and trans-vitamin D compound, respectively, dissolved in a suitable solvent system, in the presence of a polymeric photosensitizer consisting of a polymer chain ("backbone") comprising covalently bound sensitizers suitable for the photochemical conversion, to light with a wavelength of preferably between approx. 300 and approx. 1,000 nm, and by then isolating the resulting previtamin D compound and cis-vitamin D compound, respectively, in which a polymeric photosensitizer is used, the polymer chain of which has been selected from the group consisting of a polyether chain, an amino groups-containing polymer chain and a block copolymer chain comprising polyether segments and/or amino groups-containing polymer segments, in such a manner that the polymeric photosensitizer dissolves in the solvent system during the exposure to radiation but either upon cooling precipitates from the solution and can be separated, or, in case said polymer chain comprises amino groups, can be protonated with a suitable acid substance and be removed in an after-treatment. The invention also relates to a polymeric photosensitizer to be used for the said method.
IPC 1-7
IPC 8 full level
C07C 401/00 (2006.01); C08F 2/50 (2006.01); C08F 8/00 (2006.01); C08F 8/30 (2006.01); C08F 8/32 (2006.01); C08G 65/20 (2006.01); C08G 65/32 (2006.01); C08G 65/333 (2006.01); C08G 65/337 (2006.01)
CPC (source: EP US)
C07C 401/00 (2013.01 - EP US); C08F 8/00 (2013.01 - EP US); C08G 65/333 (2013.01 - EP US); C08G 65/337 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE ES FR GB GR IT LI LU NL SE
DOCDB simple family (publication)
EP 0373687 A1 19900620; EP 0373687 B1 19930602; AT E90075 T1 19930615; AU 4615589 A 19900614; AU 622958 B2 19920430; CA 2004816 A1 19900612; DE 68906866 D1 19930708; DE 68906866 T2 19930909; DK 615789 A 19900613; DK 615789 D0 19891207; ES 2055019 T3 19940816; IL 92635 A0 19900831; JP H02202870 A 19900810; US 5035783 A 19910730; ZA 899375 B 19900829
DOCDB simple family (application)
EP 89202959 A 19891122; AT 89202959 T 19891122; AU 4615589 A 19891211; CA 2004816 A 19891207; DE 68906866 T 19891122; DK 615789 A 19891207; ES 89202959 T 19891122; IL 9263589 A 19891211; JP 32042389 A 19891209; US 44750989 A 19891207; ZA 899375 A 19891207